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Property and equipment - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment      
Depreciation, Depletion and Amortization $ 7,876 $ 6,441 $ 6,305
Headquarter Disposal Costs   $ 2,763